THE CREW'S JOB WAS TO MOVE THE SECTION POWER CENTER. THE FOREMAN ATTACHED A BELT CHAIN TO THE SCOOP AND POWER CENTER AND WHEN THEY BEGAN PULLING THE CHAIN BROKE. THE CHAIN FLEW OVER THE POWER CENTER AND STRUCK THE SUPERVISOR IN THE MOUTH. THE EMPLOYEE NEEDED STITCHES AND A TOOTH WAS DAMAGED BUT RETURNED TO WORK HIS NEXT SCHEDULED SHIFT.